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    <title>Document</title>
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  <body>
    <script>
      // filter 筛选数组
      var arr = [12, 66, 4, 88, 3, 7]
      var newArr = arr.filter(function (value, index) {
        // 返回多于20的数据
        // return value >= 20;
        // 返回偶数
        return value % 2 === 0
      })
      console.log(newArr)
    </script>
  </body>
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